Doses de nitrogênio em cobertura no feijoeiro em sucessão a gramíneas no cultivo de inverno-primavera

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Efeito de sistemas de manejo do solo e velocidade de semeadura no desenvolvimento do sorgo forrageiro

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estimativas de parâmetros genéticos em linhagens avançadas de soja

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Características agronômicas e qualidade comercial de cultivares de milho pipoca em alta população

Agronomic characteristics and commercial quality of popcorn maize cultivars. In order to identify popcorn cultivars that constitute a viable alternative For popcorn producers, an experiment was conducted using a randomized blocks experimental design with Five genotypes (BRS Angela, Zelia, IAC 112, IAC 12 and IAC TC-01) and four repetitions, during the 2003/2004 crop. The experiment was carried out with 60 cm spacing between lilies and density of 75 thousand plants per hectare. During the experiment, agronomic and commercial characteristics were evaluated, under field and laboratory conditions. The variety BRS Angela featured increased yield, followed by simple hybrids IAC, with Zelia (triple hybrid) showing lower yield. The simple hybrid IAC 12 showed the lowest commercial quality of popcorn. Grain production was positively associated with the number of grains per car and with the weigh of 1,000 grains, and negatively with the level of N(total) in grain. The commercial quality was negatively influenced by the weigh of 1,000 grains.

Qualidade da semeadura direta de milho com dois mecanismos de pressão no disco sulcador sob duas velocidades

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Atributos físicos e químicos do solo e desempenho agronômico da cultura da soja submetido a sistemas de manejos e residual de gesso

Pós-graduação em Agronomia - FEIS

Análise econômica da produção de soja rr2 pro e soja rr1: estudo de caso no Estado de Mato Grosso

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Desempenho do capim-açú e do capim-canarana em função da adubação com nitrogênio e potássio

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Produção de soja e milho cultivados sobre diferentes coberturas

The no-tillage system is an important technique for maintaining and restoring the productive capacity of conventionally managed soils and degraded areas. The aim of this study was to evaluate the production of soy and maize grown on the straw of five cover crops and on spontaneous vegetation. The experiments were carried out in Votuporanga, in the state of Sao Paulo and in Selviria, in Mato Grosso do Sul, Brazil, in March 2008, after conventional soil preparation. The experimental design was of randomised blocks with four replications, using the following cover crops in different amounts of seed per hectare, to make up the treatments: Sorghum bicolor - 6, 7 and 8 kg ha(-1); Pennisetum americanum - 10, 15 and 20 kg ha(-1); Sorghum sudanense - 12, 15 and 18 kg ha(-1); S. bicolor and S. sudanense hybrid - 8, 9 and 10 kg ha(-1); and Urochloa ruziziensis - 8, 12 and 16 kg ha(-1). A control treatment with spontaneous vegetation was also used. After management of the cover crops, soy was planted in the first year of the study, and maize sown in the second, both under a no-tillage system. The dry matter accumulated by the different cover crops, and the agronomic characteristics of the soy and maize were all evaluated. It was concluded that the different cover plants proved to be good options for preceding the soy crop in Votuporanga, SP and the maize in Selviria, MS, and that the different amounts of seed used for each cover crop resulted in differences in relation to the agronomic characteristics of the crops of soy and maize.

Hormesis method for increasing oat straw with a view to viability of direct-seeding systems

In conservation agriculture, mainly under direct seeding, maintaining the vegetation ground cover is essential, since this serves as a reservoir of nutrients which are slowly released to plants by microorganisms. Some authors have sought to study increases in the amount of straw in the soil, in addition to slowing down the process of decomposition, with hormesis being one of the techniques used. This technique states that all chemical substances are both poisonous and nonpoisonous, with only the dosage determining whether they are lethal or not. This study aimed to evaluate the dry weight and agronomic characteristics of a crop of black oat subjected to hormesis. The experimental design was of randomised blocks, with 12 treatments and 4 replications, giving a total of 48 experimental lots. The treatments were: Haloxyfop-R Methyl Ester at dosages of 0.625, 1.25 and 2.50 g ha(-1); Glyphosate at dosages of 12.50, 25.00 and 50.00 g ha-1; 2,4-D dimethylamine salt at dosages of 100.00, 200.00 and 300.00 g ha(-1); Alterbane at a dosage of 500.00 g ha(-1); Salicylic acid at a dose of 100 g ha(-1); and a control. It was concluded that for the subdosages under test, the herbicides 2,4-D at medium dosage and Verdict at low dosage were shown to be the best treatments for conserving straw as ground cover under direct seeding.

Adubação fosfatada em variedades de cana-de-açúcar cultivadas em ambiente restritivo de cerrado

Pós-graduação em Agronomia - FEIS

Caracterização de Híbridos Simples Experimentais de Milho (Zea Mays L.)

Pós-graduação em Agronomia - FEIS

Qualidade dos processos mecanizados de semeadura e colheita na cultura da soja

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Caracterização fisiológica, bioquímica e anatômica em genótipos de algodoeiro herbáceo (gossypium hirsutum l.var. latifolium hutch) em função da aplicação de cloreto de mepiquat

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação de acessos de germoplasma do gênero Paspalum na Amazônia Oriental

This study was carried out at Campo Experimental do Cerrado in Embrapa Amapá, Brazil, aiming to select, based on the agronomic characteristics of productivity, dry matter and nutritional quality of the forage, the accesses of species from the genus Paspalum that possess potentiality of use as forage plants. During the years 2000, 2001 and 2002, 21 accesses of grasses were evaluated, including 18 of Paspalum and three control species: Brachiaria decumbens, Andropogon gayanus cv. Baetí and Brachiaria brizantha cv. Marandú. The experimental design was complete randomized block with three replications. The variables studied were: production of dry matter, neutral detergent fiber on the dry matter, in vitro digestibility of dry matter and crude protein content in the dry matter. All the accesses showed marked reduction in productivity and quality of produced forage, when the climatic conditions became unfavorable, showing that Paspalum as the other tropical grasses have high seasonal production. Based on the variables studied, the selected accesses were P. guenoarum (BRA-014851), P. atratum (BRA-9661) and Paspalum sp. (BRA- 009407).